If that's your 0-9 unit (can't read the label in the photo) it's solenoid is probably being held in by the N relay which is the 1 point relay. Is that relay stuck on too? It's probably in the head, not far from the score reels.
Royal Guard 0-9 unit (resized).jpg
If you can't find a stuck 1 point switch on the playfield as EMsInKC suggested, check the normally closed switch on the 1pt score reel. That should open when the score reel advances, releasing the N relay which should release the 0-9 unit solenoid.
/Mark